40139957 has 8 divisors (see below), whose sum is σ = 47157600. Its totient is φ = 33683760.

The previous prime is 40139933. The next prime is 40139959. The reversal of 40139957 is 75993104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40139957 - 2⁶ = 40139893 is a prime.

It is a super-2 number, since 2×40139957² = 3222432295923698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40139957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40139959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140207 + ... + 140492.

It is an arithmetic number, because the mean of its divisors is an integer number (5894700).

Almost surely, 2^40139957 is an apocalyptic number.

It is an amenable number.

40139957 is a deficient number, since it is larger than the sum of its proper divisors (7017643).

40139957 is a wasteful number, since it uses less digits than its factorization.

40139957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280723.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 40139957 is about 6335.6102310669. The cubic root of 40139957 is about 342.3935968693.

The spelling of 40139957 in words is "forty million, one hundred thirty-nine thousand, nine hundred fifty-seven".